Multi-Cell Channel State Information-Reference Symbol Patterns for Long Term Evolution Extended Cyclic Prefix and Code Division Multiplexing-Time Multiplexing

1. A method of wireless communication of channel state information-reference symbols (CSI-RS) between a base station having multiple antenna and at least one user equipment in code division multiplexing-time (CDM-T) multiplexing comprising the steps of: each user equipment determining a cell group CSI-RS pattern (10, 11) in physical resource blocks (PRBs) having an X-axis of time in Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Y-axis of frequency in Resource Elements (RE) from Cell-ID modulo 3: each user equipment mapping their Cell-ID to an element in a set of candidate OFDM pairs to choose a corresponding OFDM symbol pair on which to transmit CDM-T multiplexed CSI-RS pilots, thereby determining OFDM symbol locations for Antenna Port (AP) 0; each user equipment determining a RE offset for Antenna Port (AP) 0 from the value of Cell-ID modulo 3; and each user equipment transmitting extended cyclic prefix (CP) CSI-RS signals on the determined portions of the PRB.

2. The method of claim 1 , wherein: said step of determining a RE offset for Antenna Port (AP) 0 determines 1 for a Cell-ID of 0 modulo 3, 0 for a Cell-ID of 1 modulo 3, and 3 for a Cell-ID of 2 modulo 3.

3. A method of wireless communication of channel state information-reference symbols (CSI-RS) between a base station having multiple antenna and at least one user equipment in code division multiplexing-time (CDM-T) multiplexing comprising the steps of: each user equipment determining a cell group CSI-RS pattern (5, 8) in physical resource blocks (PRBs) having an X-axis of time in Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Y-axis of frequency in Resource Elements (RE) from Cell-ID modulo 3; each user equipment mapping their Cell-ID to an element in a set of candidate OFDM pairs to choose a corresponding OFDM symbol pair on which to transmit CDM-T multiplexed CSI-RS pilots, thereby determining OFDM symbol locations for Antenna Port (AP) 0; each user equipment determining a RE offset for Antenna Port (AP) 0 from the value of Cell-ID modulo 3; and each user equipment transmitting extended cyclic prefix (CP) CSI-RS signals on the determined portions of the PRB.

4. The method of claim 3 , wherein: said step of determining a RE offset for Antenna Port (AP) 0 determines 0 or 3 for a Cell-ID of 0 modulo 3, 3 or 5 for a Cell-ID of 1 modulo 3, and 6 or 8 for a Cell-ID of 2 modulo 3.

5. A method of wireless communication of channel state information-reference symbols (CSI-RS) between a base station having multiple antenna and at least one user equipment in code division multiplexing-time (CDM-T) multiplexing comprising the steps of: each user equipment determining a cell group CSI-RS pattern (4, 5) in physical resource blocks (PRBs) having an X-axis of time in Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Y-axis of frequency in Resource Elements (RE) from Cell-ID modulo 3; each user equipment mapping their Cell-ID to an element in a set of candidate OFDM pairs to choose a corresponding OFDM symbol pair on which to transmit CDM-T multiplexed CSI-RS pilots, thereby determining OFDM symbol locations for Antenna Port (AP) 0; each user equipment determining a RE offset for Antenna Port (AP) 0 from the value of Cell-ID modulo 3; each user equipment transmitting extended cyclic prefix (CP) CSI-RS signals on the determined portions of the PRB; and wherein Antenna Ports (AP) 2 and 3 are disabled.

6. The method of claim 5 , wherein: said step of determining a RE offset for AP 0 determines 2 for a Cell-ID of 0 modulo 3, 5 for a Cell-ID of 1 modulo 3, and 8 for a Cell-ID of 2 modulo 3.

7. A method of wireless communication of channel state information-reference symbols (CSI-RS) between a base station having multiple antenna and at least one user equipment in code division multiplexing-time (CDM-T) multiplexing comprising the steps of: each user equipment determining a cell group CSI-RS pattern (7, 8) in physical resource blocks (PRBs) having an X-axis of time in Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Y-axis of frequency in Resource Elements (RE) from Cell-ID modulo 3; each user equipment mapping their Cell-ID to an element in a set of candidate OFDM pairs to choose a corresponding OFDM symbol pair on which to transmit CDM-T multiplexed CSI-RS pilots, thereby determining OFDM symbol locations for Antenna Port (AP) 0; each user equipment determining a RE offset for Antenna Port (AP) 0 from the value of Cell-ID modulo 3; each user equipment transmitting extended cyclic prefix (CP) CSI-RS signals on the determined portions of the PRB; and wherein Antenna Ports (AP) 2 and 3 are disabled.

8. The method of claim 7 , wherein: said step of determining a RE offset for Antenna Port (AP) 0 determines 1 for a Cell-ID of 0 modulo 3, 4 for a Cell-ID of 1 modulo 3, and 7 for a Cell-ID of 2 modulo 3.

9. A method of wireless communication of channel state information-reference symbols (CSI-RS) between a base station having multiple antenna and at least one user equipment in code division multiplexing-time (CDM-T) multiplexing comprising the steps of: each user equipment determining a cell group CSI-RS pattern (5, 7) in physical resource blocks (PRBs) having an X-axis of time in Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Y-axis of frequency in Resource Elements (RE) from Cell-ID modulo 3; each user equipment mapping their Cell-ID to an element in a set of candidate OFDM pairs to choose a corresponding OFDM symbol pair on which to transmit CDM-T multiplexed CSI-RS pilots, thereby determining OFDM symbol locations for Antenna Port (AP) 0; each user equipment determining a RE offset for Antenna Port (AP) 0 from the value of Cell-ID modulo 3; each user equipment transmitting extended cyclic prefix (CP) CSI-RS signals on the determined portions of the PRB; and wherein Antenna Ports (AP) 2 and 3 are disabled.

10. The method of claim 9 , wherein: said step of determining a RE offset for Antenna Port (AP) 0 determines 0 for a Cell-ID of 0 modulo 3, 3 for a Cell-ID of 1 modulo 3, and 6 for a Cell-ID of 2 modulo 3.